CONCORD — The Attorney General's Office said Friday that it has charged Robert Dellinger, who is accused of killing two people in a car accident while trying to kill himself, with upgraded charges of second-degree murder.

The charges against Dellinger, 53, of Sunapee, who had been arraigned on manslaughter charges, were upgraded because he recklessly caused "the deaths of Amanda Murphy and Jason Timmons on Saturday, Dec. 7, 2013, on I-89 in Lebanon, New Hampshire, under circumstances manifesting an extreme indifference to the value of human life," a news release said Friday night.

Authorities have said Dellinger left his home on Dec. 7 after having an argument with his wife over his depression medication and a bedtime curfew imposed by his doctor, and headed south on I-89 in his 2005 Chevy pickup. In an attempt to commit suicide, Dellinger drove to a spot in the highway where the median had a slight rise and no guardrails. He crossed into the median, went airborne into the northbound side of I-89 and sheered the roof off a car driven by Murphy, officials said.

The couple's unborn child was also killed in the accident.

Dellinger will be arraigned on the new charges Friday in Lebanon Circuit Court. The time of the proceeding hasn't yet been set, the release said.